pinky Posted July 10, 2020 Report Share Posted July 10, 2020 I am a little lost re tr3 tr3b tr4 tr4a flywheel First thanks to mick for his help I have a tr3b engine that I am turning into a fast road, (hopefully) The tr3b flywheel weighs 30lbs approximately, has seperate ring gear with 90 teeth I want to use a tr6 clutch with a suitable flywheel I believe I have to have a tr4a flywheel The engine is going over to Saunders enginering for balancing crack detection etc, So can I lighten the tr3b flywheel and get it re-drilled for a tr6 clutch, Might have a chance to buy a standard tr4a flywheel, but cant seem to find a part no, or pic of item, so they can identify the correct flywheel, did the flywheels have part no stamped on them Can anyone hold my hand please Cheers pink Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 10, 2020 Report Share Posted July 10, 2020 (edited) 2 hours ago, pinky said: I am a little lost re tr3 tr3b tr4 tr4a flywheel First thanks to mick for his help I have a tr3b engine that I am turning into a fast road, (hopefully) The tr3b flywheel weighs 30lbs approximately, has seperate ring gear with 90 teeth I want to use a tr6 clutch with a suitable flywheel I believe I have to have a tr4a flywheel The engine is going over to Saunders enginering for balancing crack detection etc, So can I lighten the tr3b flywheel and get it re-drilled for a tr6 clutch, YES REDRILL AND LIGHTEN GET BALANCED WITH CLUTCH THERE IS A COMPANY IN WALES WHO ADVERTISE ON EBAY THAT DO EXCHANGE LIGHTENED FLYWHEEL eurekatriumph.com Quote Might have a chance to buy a standard tr4a flywheel, but cant seem to find a part no, or pic of item, so they can identify the correct flywheel, did the flywheels have part no stamped on them NO PART NUMBER STAMPED ON FLYWHEEL THAT I HAVE EVER SEEN. Quote Can anyone hold my hand please Cheers pink Cheers Peter W Edited July 10, 2020 by BlueTR3A-5EKT Quote Link to post Share on other sites
pinky Posted July 11, 2020 Author Report Share Posted July 11, 2020 As suggested previously, I contacted eureka triumph, unfortunately his father has just passed away, who used to sort out all 2, 3,4s, so things have been difficult for them Pink Quote Link to post Share on other sites
pinky Posted July 11, 2020 Author Report Share Posted July 11, 2020 Thank you Peter for your help, so to conclude I am going to use the 3b flywheel, (30lbs, 90 teeth removable starter ring) drilled for tr6 clutch, the flywheel weight reduced to 20lbs Just a thought, could I use a tr6 flywheel, redrilled to fit the crank, have a spare one of them (just a thought) Cheers pink Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 11, 2020 Report Share Posted July 11, 2020 1 hour ago, pinky said: Thank you Peter for your help, so to conclude I am going to use the 3b flywheel, (30lbs, 90 teeth removable starter ring) drilled for tr6 clutch, the flywheel weight reduced to 20lbs Hamish did all this 2 years ago in his TR3A https://www.tr-register.co.uk/forums/index.php?/topic/64890-lightening-the-flywheel/ Just a thought, could I use a tr6 flywheel, redrilled to fit the crank, have a spare one of them (just a thought) I have never seen it done plus you will need a to change the starter motor. - can of expensive worms and very red herring. Suggest you check which TR6 flywheel it is and if it is an early one for a long back crank you find a TR5 victim customer. That could pay for your 3B flywheel mods. Cheers Peter W Quote Link to post Share on other sites
Hamish Posted July 11, 2020 Report Share Posted July 11, 2020 (edited) You could try Pete Cox he drilled and dowled my 3a flywheel for the diaphragm clutch and supplied the clutch. my flywheel was already lightened a little but I’m sure he could help /advise on that. as you can see he has done a variety of work for me at a very fair price.https://petecoxsportscars.co.uk/testimonials Edited July 11, 2020 by Hamish Pics Quote Link to post Share on other sites
Bfg Posted July 11, 2020 Report Share Posted July 11, 2020 14 hours ago, pinky said: am a little lost re tr3 tr3b tr4 tr4a flywheel if it's of any help I went through the same learning curve < here > ..which was happily concluded < here > Pete. Quote Link to post Share on other sites
Andy Moltu Posted July 11, 2020 Report Share Posted July 11, 2020 You could just get a lightweight steel one ready drilled for the 4A ring gear, thus avoiding the cost of lightening and the concern that the wheel has become weakened and you don’t want your feet near that much metal whizzing around at 6000rpm when it breaks up. If you do, get it done by someone who knows what they are doing and have experience of working on TR flywheels. There is a difference between knowing how to operate the machinery and where it is safe to take away the metal without causing critical weakness. There is little doubt the 4 cylinder flywheel is an overweight lump more suited to its tractor use and can benefit pick up if lightened quite considerably without hindering drivability. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 11, 2020 Report Share Posted July 11, 2020 Weighs 10 lbs without ring gear https://www.summitracing.com/parts/FIZ-172441 Quote Link to post Share on other sites
Hamish Posted July 11, 2020 Report Share Posted July 11, 2020 You can go closer to home http://www.triumphspecialtuning.com/index.php?route=product/product&path=36&product_id=55 Quote Link to post Share on other sites
Chris Hubball Posted July 11, 2020 Report Share Posted July 11, 2020 +1 for Pete Cox. He had my TR4 Flywheel lightened to approx 19 lbs and drilled for a diapragm clutch just the right amount for road use make, sure you have the flywheel and clutch assy balanced together, I previously had a steel flywheel weighing 10 lbs not in my opinion suitable for road use, great pickup but the drop off to dramatic. Cheers Chris. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.